Increase in influenzal meningitis.
D000367:Age Factors; D000906:Antibodies / Q000032:analysis; D002648:Child; D002675:Child, Preschool; D003968:Diarrhea, Infantile / Q000453:epidemiology; D006193:Haemophilus influenzae / Q000276:immunology; D006782:Hospitals, Special; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D008583:Meningitis, Haemophilus / Q000453:epidemiology*; D008585:Meningitis, Meningococcal / Q000453:epidemiology; D008586:Meningitis, Pneumococcal / Q000453:epidemiology; D010414:Pennsylvania
D000906:Antibodies